Search Publications
Praesepe (NGC 2632) and its tidal tails
Röser, Siegfried; Schilbach, Elena
Aims: Within a 400 pc sphere around the Sun, we search for Praesepe's tidal tails in the Gaia Data Release 2 (DR2) data set.
Methods: We used a modified convergent-point method to find stars with space velocities close to the space velocity of the Praesepe cluster.
Results: We find a clear indication for the existence of Praesepe's …
Dust of comet 67P/Churyumov-Gerasimenko collected by Rosetta/MIDAS: classification and extension to the nanometer scale
Ehrenfreund, P.; Bentley, M. S.; Mannel, T. +9 more
Context. The properties of the smallest subunits of cometary dust contain information on their origin and clues to the formation of planetesimals and planets. Compared to interplanetary dust particles or particles collected during the Stardust mission, dust collected in the coma of comet 67P/Churyumov-Gerasimenko (67P) during the Rosetta mission p…
Multiple water band detections in the CARMENES near-infrared transmission spectrum of HD 189733 b
Schmitt, J. H. M. M.; Alonso-Floriano, F. J.; Sánchez-López, A. +27 more
Aims: We explore the capabilities of CARMENES for characterising hot-Jupiter atmospheres by targeting multiple water bands, in particular, those at 1.15 and 1.4 µm. Hubble Space Telescope observations suggest that this wavelength region is relevant for distinguishing between hazy and/or cloudy and clear atmospheres.
Methods: We obs…
Two new free-floating or wide-orbit planets from microlensing
Kaspi, Shai; Maoz, Dan; Han, Cheongho +57 more
Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detected during gravitational microlensing events. Microlensing events caused by rogue planets are characterized by very short timescales tE (typically below two da…
Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona
Nakariakov, V. M.; Kolotkov, D. Y.; Zavershinskii, D. I.
Context. Rapidly decaying slow magnetoacoustic waves are regularly observed in the solar coronal structures, offering a promising tool for a seismological diagnostics of the coronal plasma, including its thermodynamical properties.
Aims: The effect of damping of standing slow magnetoacoustic oscillations in the solar coronal loops is investig…
Multiplicity of Galactic Cepheids and RR Lyrae stars from Gaia DR2. I. Binarity from proper motion anomaly
Mérand, Antoine; Gieren, Wolfgang; Gallenne, Alexandre +8 more
Context. Classical Cepheids (CCs) and RR Lyrae stars (RRLs) are important classes of variable stars used as standard candles to estimate galactic and extragalactic distances. Their multiplicity is imperfectly known, particularly for RRLs. Astoundingly, to date only one RRL has convincingly been demonstrated to be a binary, TU UMa, out of tens of t…
High gas-to-dust size ratio indicating efficient radial drift in the mm-faint CX Tauri disk
Tazzari, M.; Facchini, S.; Manara, C. F. +7 more
The large majority of protoplanetary disks have very compact continuum emission (≲15 AU) at millimeter wavelengths. However, high angular resolution observations that resolve these small disks are still lacking, due to their intrinsically fainter emission compared with large bright disks. In this Letter we present 1.3 mm ALMA data of the faint dis…
The Close AGN Reference Survey (CARS). A massive multi-phase outflow impacting the edge-on galaxy HE 1353-1917
Gaspari, M.; Combes, F.; Scharwächter, J. +15 more
Context. Galaxy-wide outflows driven by star formation and/or an active galactic nucleus (AGN) are thought to play a crucial rule in the evolution of galaxies and the metal enrichment of the inter-galactic medium. Direct measurements of these processes are still scarce and new observations are needed to reveal the nature of outflows in the majorit…
The mean Hα EW and Lyman-continuum photon production efficiency for faint z ≈ 4-5 galaxies
Bacon, Roland; Boogaard, Leindert A.; Mahler, Guillaume +9 more
We present the first measurements of the Lyman-continuum photon production efficiency ξion, 0 at z ∼ 4-5 for galaxies fainter than 0.2 L* (-19 mag). ξion, 0 quantifies the production rate of ionizing photons with respect to the UV luminosity density assuming a fiducial escape fraction of zero. Extending previous me…
Cloudlet capture by transitional disk and FU Orionis stars
Kramer, M.; Fukagawa, M.; Dullemond, C. P. +3 more
After its formation, a young star spends some time traversing the molecular cloud complex in which it was born. It is therefore not unlikely that, well after the initial cloud collapse event which produced the star, it will encounter one or more low mass cloud fragments, which we call "cloudlets" to distinguish them from full-fledged molecular clo…